Latch



(Model.) v

l W; R. GEISSLER.

' Latch. No.-240,40 3. *I Patented Ap,ri|,19,"l"8"8l`.

Firm Pmmmoemnsnl msumm'ou. o. cl,

` UNITED STATES W. ROBERT GEISSLER,

'OF CHICAGO, ILLINOIS.

LATCH.

'SPECIFICATION forming part' of Letters Patent No. 240,403, dated April 19, 1881.

Application fled'Febrnai-y '7, 1881. (Model.)

To all whom it may concern:

Beit known that I, W. ROBERT GEIssLER,

Y va subject of the Emperor of Germany, residing at Chicago, in the county of Cook and State of Illinois, have invented a certain new and useful Improvement in Door-Latches, of which the following is a specification.

The object I have in view is to produce means for withdrawing the pivoted and swinging latches of door-locks, which will operate easier and with less friction than heretofore, will have no lost motion, and will be simple and cheap in construction.

My invention therein consists in the peculiar Vdevices and combinations of devices employed by me for this purpose, as fully hereinafter explained, and pointed out by the claims.

In the accompanying drawings, forming a part hereof, Figure 1 is a View of the mechanism of the latch, the case-cover and nearest knob being removed Fig. 2, a section ot' the same on line 2 2; Fig. 3, a separate view of the wiper-yoke, and Fig. 4 a separate viewof the spindle and wiper.

Like letters denote corresponding partsin all four figures.

A is the case of the latch, which is preferably a rim-latch, as shown. Such case is provided on its front edge with two arms, a, extending at right angles to the body of the case, between which is pivoted the swinging latch B by means of a pin passed through the ends of the arms. Within the case, at its free end, the swinging latch is provided with lugs b, to which a bar, C, is pivoted by a vertical pin, c. The hole through which the pin c passes can be elongated horizontally to a small extent, if desired, to allow for the difference in movement between the swinging latch andsliding bar 5 but this is not essential. The bar C, at its other end, is forked and embraces a lug projecting from the wiper-yoke D, being pivoted thereto by a horizontal pin, d. This joint allows the yoke to swing vertically to a limited extent independent of the bar C. This independent movement decreases greatly the strain and friction upon the workin g parts when the spindle is turned. In turning the spindle the end of one of the wiper-arms bears against a shoulder on the yoke at a distance from the central line, extending from the spindle to the latch, equal to the length of the wiper-arm; but as the spindle is turned the end of the wiper-arm approaches such central line, and would have to move on the shoulder of the yoke if such yoke were joined rigidly with the connecting-bar C, and considerable friction Vwould have to be overcome at the expense of straining and wearing the parts. The joint provided by me, however, overcomes this difficulty, the yoke swinging to accommodateitself to the wiper and the bearing ofthe Wiper on the yoke not being changed. A spring, E, serves to throw the swinging latch outwardly.

F is the square spindle of the latch. It is coupled loosely with the shank of the knob G, such knob being permanently secured to the case A. The knob, at the other end of such spindle, is secured thereto by a screw. H is a plate, (preferably of steel,) which is secured by rivets e directly to the spindle F, and projects on each side thereof to form the wiperarms. The ends of these wipers bear on the rounded shoulders ff of-the yoke D while the spindle rests in the central slot, g, of the yoke, made for that purpose. p

By having the wiper-arms formed by a plate secured directly to the spindle the latch is simplied in con struction, and there is no lost motion, as in the ordinary construction, where the spindle is inclosed by a loose sleeve carrying the wiper-arms.`

The swinging wiper-yoke and peculiar Wipers together form an exceedingly simple mechanism, and one that operates efliciently with the minimumamount of friction and lost motion.

l'. In a door-latch, the combination, with the swinging latch B, of the connecting-bar C, pivoted thereto, and the wiper-yoke D, pivoted to the connecting-bar and swinging vertically thereon, substantially as described and shown.

2. In a door-latch, the combination, with the swinging latch B, of the connecting-bar C, pivoted thereto, the yoke D, pivoted to the connecting-bar, the spindle F, having the plate H, formingthe wipers, secured directly thereto, and the spring E, all constructed and arranged substantially as described and shown.

W. ROBERT GEIssLER.

Witnesses F. W. KAsEHAGrEN,

EMIL H. FRoMivLANN. 

